[issue42969] pthread_exit & PyThread_exit_thread are harmful

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

C-APIs such as `PyEval_RestoreThreads()` are insufficient for the task they are asked to do.  They return void, yet have a failure mode.

They call pthread_exit() on failure today.

Instead, they need to return an error to the calling application to indicate that "The Python runtime is no longer available."

Callers need to act on that in whatever way is most appropriate to them.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42969>
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